package cn.itcast.gateway.filter;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
@Order(-1)//过滤器的优先级 也可以实现orderd接口
//@Component
public class AuthorizeFilter implements GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1、获取请求参数
        ServerHttpRequest request = exchange.getRequest();
        MultiValueMap<String, String> queryParams = request.getQueryParams();
        //2、获取请求参数中的 authorization 参数
        String auth = queryParams.getFirst("authorization");
        //3、判断参数值是否等于 admin
        if("admin".equals(auth)){
            //4、是，放行
            return chain.filter(exchange);
        }
        //5、否，拦截
        //设置状态码
        exchange.getResponse().setStatusCode(HttpStatus.FORBIDDEN);//未授权
        return exchange.getResponse().setComplete();
    }
    /*
        三种过滤器的执行顺序：
            order值越小执行优先级越高
            当order值一样时，顺序是defaultFilter最先，然后是局部的过滤器，最后是全局过滤器

     */
}
